What was found
AIRCRAFT IN BASE MAINTENANCE: CORROSION OF AFT CARGO DOOR THRESHOLD TORSION BOX COVER SHEET IN PREVIOUSLY BLENDED AREA AT FR56R+7" AND STR 37R, MEASURING L=2.0 IN, W=0.5 IN, D=0.018 IN. REPLACED COVER SHEET WITH NEW IAW SRM 51-72-11-911.